Aresearcher is interested in studying the
effectiveness of two brands of over-the-counter
cold medications. at the beginning of the fall
semester, she finds 20 students who use brand a
for their cold, and another 20 students who
use brand b for their cold. at the end of the
semester, she totals the number of days that
each student experienced cold symptoms. she
performs a statistical analysis, and concludes that
students who used brand a experienced fewer
days with cold symptoms versus the students
who used brand b. which of the following
statements is true?
o. in this study, the factor is the number of
days that each student experienced cold
symptoms.
the relationship that the researcher found
could be due to a confounding variable.
the researcher used a control group and
randomization in her design.
od none of the above are true